Metoprolol Interactions with Food and HerbsPotassium Rich Foods: Metoprolol is a beta blocker which increases the potassium level in the blood. Potassium-rich foods like meat, milk, bananas and sweet potatoes when taken with beta blockers can result in high blood potassium levels.
Pleurisy Root: Cardiac glycosides present in the pleurisy root may interfere with the effect of metoprolol.
Other Herbs: Kava-Kava, valerian, ginseng, goldenseal, licorice, saw palmetto, hawthorn, ma huang and yohimbe may interact with metoprolol. If you take metoprolol, you should avoid taking these herbs.